Safety device for driers



June 251929. A, KALK l1,713,561

SAFETY DEVICE FOR DRIERS Filed Aug. 23, 1926 Illlllllllll IIIIIIII ai f- 24 wl; 20 g';

lllllllllllllllllll man a /faz/ v Patented June 25, 1929.

UNITED STATES PATENT OFFICE.

ALBERT C. KALK, 0F CHICAGO, ILLINOIS, ASSIGNOR TO INVINCIBLE LANDRY EQUIPMENT C0., A CORPORATION 0F ILLINOIS.

SAFETY DEVICE FOR DRIERS.

Application filed August 23, 1926. Serial No. 131,019.

mally out of .mesh with the driving gear but which may be shifted into mesh therewith V for operating the same after the motor has stopped for bringing the door on the cylinder into the proper position, for anattendant to unload the cylinder. There is more or less danger' involved in having someone tamper with the hand operated pinion and shifting the same into operative position while the drier is running, whereby the rapidly rotating crank handle on the pinion may cause injury to some one, especially the one who is doing the tampering.

It is an object of this invention to eliminate this danger, in the provision of a conneet-ion between the hand operated pinion and motor switch whereby the pinion cannot be shifted while the motor is ruiming; that is, when the motor switch is in closed position. f

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings which -illustrate a preferred embodiment of this invention and in which similar reference numerals refer to similar features in the different views:

r Figure 1 is a fragmentary elevational view of the driving mechanism of a drying machine.

Figure 2 is an enlarged plan view with parts in section taken substantially upon the line II-II of Figure l'.

Figure 3 is an enlarged sectional view taken substantially upon the line III-III of vliigure 2 with the shaft 18 omitted.

Figure 4 is an enlarged sectional view taken substantially upon the line IV--IVof Figure 2 with the parts shifted to normal operative posit-ion.

Figure 5 is an enlarged fragmentary side elevational view of the switch box.

Figure 6 is an enlarged plan view of the bifurcated plate 17, of Figure 2.

. In the drawing, there is shown a driving or power shaft 1 which is adapted to be driven by a belt 2 and pulley.V A pinion 3 .is secured upon the end of the shaft 1 and drives a gear 4 which is fixed upon one end of the cylinder supporting shaft 5. The belt 2 is adapted to be connected to a motor (not shown) and together with the gears 3 and 4, constitute the power drive for the cylinder. The manual drive for the cylinder comprises a pinion 6 secured upon a slidably mounted shaft 7 having a crank S thereon by which it may be manually rotated. The shaft 7 is slidably mounted Vin a bearing 9 in the frame 9il of the machine. The pinion 6 is normally out of mesh with the gear 4 and is positioned between such gear and the bearing 9. When the motor has stopped and it is desired to manually rotate the cylinder, the pinion 6 is pulled outwardly. The mechanism so far described and the drier associated therewith are shown in the Butzbach Patent No. 1,549,744, to which reference may be had.

This invention concerns itself with means for preventing the pinion 6 from being shifted into mesh with t-he gear 4 until the motor circuit has been opened. To this end, the motor switch 10 is attached by a suitable bracket 1l to the side of the frame 9'l of the machine and adjacent the inner end of the shaft 7. This switch is illustrated as of the push button type in which the push buttons are indicated by the references 12 and 13.

The inner corners of the switch box are provided with under-cut bearings or sockets 14 for receiving the trunnions 15 on the arms 16 of a bifurcated plate 17, the bifurcation of which receives the push button 13 as shown in Figure 2, and the solid portion of which is provided with a narrow neck or projection 17"L which extends over the push button 12, as shown in Figures 2 and 4. A shaft 18 is journalled in the sides of the switch box above the plate 17. The portion of the shaft 18 directly over the plate 17 has a flat portion 19 in cont-act with such plate when the push button 12 is in elevated position. AA

handle 2O is secured upon the shaft 18 and this handle is provided with stop lugs 21 for limiting the swinging movement thereof. These stop lugs are adapted to engage a suitable casting 22 on the switch box. The bi'liurcated arms of the plate 17 are provided with rising lugs 23 which extend above the shaft 18 and which consequently maintains the plate 17 in position.

An angle member 24 is securedA upon the end of the shaft 7. It will be noted that the vertical portion thereof is rigidly attached to the shaft while the horizontal portionv extends over the switch box and over the neck 17a of the plate 17 This horizont-al portion is provided with a notch or cut out portion 25 (Figure 2) which is similar to the neck 17l on the plate 17 and is of such va size that the said neck 1,7Tmay pass therethrough.

It willibe understoodthat the electric motor that operates the drier will be connected tothe switch 1() and that the switch button 13 must Vbe, depressed to start the motor. As

thepush buttonl` is depressed, the push but,-

ton 12will rise. "lVhen the pinion 6 is located in its inoperative position between the gear 4 and the frame of the machine, the cut out portion'25 willbe directly over the neck 17a onplate 1 7 andthe motor may be started by depressing the button 13, the button 12 rising and elevating the neck 17n into the cut out portion 25 of thevangle member 24, as shown in Figure4. Iith the neck 17 n in such cut out portion, the plate 17 willact as a stop andprevent any one from shifting the pinion 6 into meshwith gear 4 while the motor is running.

Then the motor has been stopped by swinge ing the handle .20 to the dotted line position shown in Figure `4and thereby depressing the neck 17L of plate 17 below the cutout` portion 25, the angle member 24 will be released from its interlocking engagement with the plate 17 and the pinion G may be shifted into mesh with gear 6. This position is shown in Figures 1 and 2, andit will be noted that the horizontalfportion ofthe angle.. 24 has been moved so thatit extends over the neckl 17fL oi. the plate 17 and preventsthe switch from beingoperated as long as the pinion 6 is in mesh with the gear 4. Before the inotorcan be vagain started, it will be necessary to shift the pinion 6 tol its inoperative position to bring` the notch 25 over the neckl 17El of plate 17.

From-the foregoing, it will be apparent that a verysimple safety device has been provided that prevents the manual operation' ofthe machine as longas the power drive is operating, and thatvonlthe other hand, pre-` vents the power drivefiom being applied as longas the manual .drive iseifective.

I, am aware thatmany changes` may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention: Y

1. In a machine of the class described, a power driving circuit embodying a switch, an auxiliary manual drive for the machine, said manual drive having means interlocking with said switch when the latter is in closed position.

2. In ay machine ofthe class described, a power driving circuit including a switch, an auxiliary manual drive for the machine hav-l ing an operative and an inoperative posit-ion, and a device on said manual drive for locking said switch in openposition. when said drive is in its operative position.

3. In a machine of the class described, a power drivingcircuit including a switch, an auxiliary manual drive for the machine having an operative and an inoperative position, and means on said manual drive adapted for interlocking engagement 'with said switch when said drive is in inoperative position and the switch is in closed position, said means locking said switch against operation Y when said switch is inopen position and said drive is in operative position.

4. In a machine ofthe class described, a power circuit includinga switch, a manual drive having a member extending over said switch and having an operative and an inoperative position, said switch being operable when said manual drive is in inoperative position andinoperative when said drive is in operative position.

5. In a machine of the class described, a` power circuit including a switch, a manual drive having an operative andan inoperative position, and a device extending over said switch, and means operable by said switch when said drive is in its inoperative position for interlocking with said device.

6. In a machine of the class described, a power circuit including a switch, a drive for the machine having an operative and an inoperative position and a member extending over said switch, means operated by said switch when said drive is in inoperative position for interlocking with said member, said member preventing operation of said switch lwhen said drive is in operative position.

first mentioned member preventing the operation of said switch when said drive is in operative position.

8. In a machine of the class described, a power circuit including a push button switch, a manual drive having an operative and an inoperative position, and a notched plate extending over` said switch, a pivoted device extending over one button of the switch and adapted to be operated by the closing of said switch for engaging said notch when said drive is in inoperative position, means for depressing said device and simultaneously opening said switch, means for shifting said drive to operative position and simultaneously moving said plate over said pivoted member for preventing the closing of said switch.

9. In a machine of the class described, a power circuit including a switch, an auxiliary manual drive having an operative and an inoperative position, means for locking said drive in its inoperative position when said switch is closed, means for unlocking said drive when the switch is opened, and means for preventing the operation of said switch when said drive is in operative position.

In testimony whereof I have hereunto subscribed my name.

ALBERT C. KALK. 

